Tool-grinding machine.



No. 820,519, PATENTED MAY 15, 1906. J. G. POOL.

TOOL GRINDING MACHINE.

APPLICATION FILED APR.29.1905.

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J.'G. POOL.

TOOL GRINDING MACHINE.

APPLICATION FILED APR. 29. 1905.

7 SHEETS-SHEET .\A/ITPIESVEIE E: 227M 6 6 /WL; M 25 No. 820,519. PATENTED MAY 15, 1906. J. G. POOL.

TOOL GRINDING MACHINE.

APPLIOATION FILED APR. 29. 1905.

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PATENTED MAY 15, 1906.

J. G. POOL. TOOL GRINDING MACHINE.

APPLICATION FILED ARR. 29. 1905.

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;- WITHEE- '5 E 5 No. 820,519. PATENTED MAY 15, 1906.

J. G. POOL.

TOOL GRINDING MACHINE.

APPLICATION FILED APR.29. 1905.

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arr-04 No. 820,519. PATENT ED MAY 15, 1906. J. G. POOL.

TOOL GRINDING MACHINE.

APPLICATION FILED APR.29.1 905.

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. J. G. POOL.

TOOL GRINDING MACHINE.

APPLICATION FILED APR. 29. 1905.

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treating UNITED sTA'rns JOHN GEORGE POOL, OF LYNN,

PATENT. OFFICE.

MASSACHUSETTS, ASSIGNOR TO NATIONAL BUNG MANUFACTURING COMPANY, OF PORTLAND, MAINE, A CORPORATION OF MAINE.

TOOL-GRINDING MACHINE.

Specification of Letters Patent.

; atenteo'i May 15, 1906.

Application filed April 29, 1905. Serial No. 258,047.

To all whom, it Wtay concern Be it known that 1, JOHN GEORGE PooL, a citizen of the United States, and a resident of Lynn, in the county of Essex and State of Massachusetts, have invented a new and use ful Tool-Grinding Machine, of which the following is a specification.

My invention relates more especially to the grinding of a cutting-tool such as is described in an applicationfor United States Letters Patent, Serial No. 252,320, filed March 27, 1905, by Edward E. Elder and myself as joint inventors for an improvement in plugcutting machines, in which ap lication there is shown a hollow cylindrica cutting-tool having advancing cutting-points with recutting-surfaces forming two V-like edges. To grind such a toolwith a rotary grinder, it is desirable that the tool and grinder shall have such a movement with relation to each other that the surfaces to be ground shall be continuously presented thereto. To this end I have shown in the present embodiment of my invention a means for rotating the tool and also a means for giving it a reciprocating movement parallel with its axis in order that the V-shaped edges may be properly ground. With these features are combined means for automatically feeding the grinder and the tool with relation to each other, so as to keep them in operative position. There is also provided means for ad'- justing the machine to grind tools of different diameters and having differently-shaped cutting edges from those shown-that is, tools in which the distance from the ti of the point to the bottom of the V varies rom 0 to that shown'that is, from a straight edge to a V-shaped edge even deeper than that shown. These and other novel details of construction will be explained in the following specification. Moreover, I have shown my invention embodied in a machine adapted to grind a cylindrical tool; but it will be apparent that it or certain of its features may be adapted to grind tools having a diiferent cross-section.

My invention will be understood by reference to the drawings, in which Figure 1 is a rear view of a machine embodying my invention. Fig. 2 is a section taken just in rear of the front wall. Fig. 3 is an end view, the wall being broken away to i disclose the interior of thecase. Fig. 4 is a sectional view on line 4 4 of Fig. 2. Fig. 5 is a vertical section on line 5 5 of Fig. 2, the gage being omitted. Fig. 6 is a vertical section on line 6 6 of Fig. 3. Fig. 7 is a Vertical section on line 7 7 ofFig. 6, and Fig. 8 is a detail of the grinder-feed. Fig. 9 is a View in plan and elevation of the head on which the tool is mounted, showing the position of the registering and holding pin therein. Fig. 10 is a view in inverted plan and elevation of the tool, showing a registering hole therein and the position which it bears to the elevated point of the tool. Fig. 11 is a view in eleva tion of the links hereinafter lettered h 7:, and Fig. 12 is a view in plan of the links hereinafter lettered h 7%.

A A are the supports upon which is mounted the casing containing the various parts, the walls of the casin bein marked a and the casin being provided with a top and bottom to keep the interior free from dust. Suitable doors or other openings are provided, so that the interior may be easily examined.

B is the main shaft, which passes through the machine ahd is suitably supported therein. It carries at one end fast and loose pulleys B"B and at the other end a drivingpulley B from which the grinder C is rotated by a belt, and beyond it a cone-pulley B, from which by means of a belt motion is given to the cone-pulley D on the countershaft D. On the counter-shaft-D is mounted a pinion d, which meshes with the gear (1 on a studd projecting from a boss (1 on the inside of the casing. A pinion d on the same stud d isarranged to turn with the gear (1 and meshes with the ear- (1 The gear (1 has pinned to it a bevel gear d, and both are mounted on a sleeve e, which carries a heartshaped cam E and is mounted on a stud d projecting from one wall of the casing. A SCHEW' an washer (i hold the sleeve on the stu The tool-holder, as shown, comprises a shaft F, having a boss at its upper end, which rests upon a sleeve F, Within which the shaft F rotates and by means of which the shaft is reciprocated in the direction of its axis. The sleeve passes up through an opening in the top of the case and is surrounded by a bushing a. The lower part of the sleeve F is supported upon the carriage H, as below dewhich sets into a .which bears against the lower .end of the sleeve F and may be adjusted to revent end -motion of the shaft F in the s eeve F by means of the set-screw as, (this arrangement also serves to compensate for any wear of these )arts which ma Y occur and is connected with a bevel-gear F below the carriage H, which meshes with the bevel-gear'd on the sleeve e, from which it gets its motion. To connect the bevel-gearF and the shaft F, the bevel-gear is rovided with a hub F earing G in a frame G, A

which is bolted to the floor of the case.

- collarf on the hub F keeps it from rising'in its bearing. The shaft F and hub F are connected by a spline and groove, so that the shaft will be rotated andmay also be reciprocated. These two motions'are necessary in order to present the tool to the grinder in such a way as to get the desired finished surface.

The tool may be mounted upon the shaft in any desired way. I prefer to make the shaft F hollow, so that any particles of emery and steel may fall through, and to use the passage also as a socket for the shank F of the toolholding chuck. In such a case the shank F is provided with a longitudinal groove F preferably semicircular in cross-section, and

a set-screw F, having a hemispherical end,

passes through the bossf and into the groove F and binds the shank F against both a twisting and a longitudinal movement. The chuckitself comprises a platform f on which the tool stands and which is threaded about its periphery, and a nut j having a lip f, which binds the tool f to the platform, (see Fig. 5,) this being a simple form of construction. In the upper surface of the platform f and as near to its periphery as is practical I prefer to drill a hole in which I insert permanently a pin or dowel y, such pin or dowel being allowed to project above the surface of the platform f about one-eighth of an inch. This pin or dowel I prefer to place so that the center of the pin and the center of the longitudinal groove F in the shank F shall lie in the same radial plane. In the bottom face of the tool or cutterf by means of a suitable jig a hole y is drilled, which will correspond both in diameter and distance from center with the diameter and distance from center of the my in platform Furthermore, this ho e y is preferably drilled on a radial plane passing through the extreme points 11 of the cutter f". Now when the cutter is placed upon the platform for grinding the now be described. Upon the side of the case to which the stud d is attached are also attached horizontal ways E, in which runs a slide E suitable gibs bein provided to hold the slide therein. This slide is slotted, so that the stud d may pass through it, and it carries two rolls 6 e located to bear upon opposite edges of the cam E, so that the rotation of the cam will give a regular reciprocation to the slide E without any lost motion. Upon the frame G, mounted on the bottom of the case, are horizontal ways g, in which runs a carriage H, held therein by gibs g, this carriage H and the slide E being connected to slide in unison, preferably in the following manner: The carriage H has pivoted to its front end a link it, which is part of .an H-shaped frame, of which the link h,

which is pivoted to the slide E is another member, these twolinks being joined by a cross-bar it near their middle. The parts it, h and h are a single casting in order to get the necessary rigidity, and this frame is pivoted by a rod k to a sleeve h", from which project two parallel links it h, integral with the sleeve, each link connecting as an integral part with a second and similar sleeve and by a similar rod supported between brackets 7?, attached to the end wall of the case. Both of thesesleeves h and both links it are a single casting. It is evident that this construction, composed as with its bearings in the same vertical plane with the points of a plication of both the power and work an each casting of such width as to completely fill the space between the bearings, together with the form of joints shown, must and does form a firm and rigid and theoretically perfect means of transmit ting the motion of the slide E across the intervening space to the slide H. The slide E and the carriage H have a motion horizon-- tally on the same plane and parallel to each other, working in the same time and direction and to the same distance. fore evident that to connect these parts the pin it on the slide E and also the similar fulcrum-screw on the carriage H must lie on the same horizontal plane, the vertical vibration of the links it it, due to radial action, being taken by the links it h. The up er ends of the links h h travel in a horizonta plane.

The tool is reciprocated vertically by means of the horizontal reciprocation of the carriage H in the following manner: Ways H are pivotally attached to the sleeve F (see Fig. 5) by means of screws H". In order to secure good mechanical construction and It is thereit is of but two castings,

walls of the case.

proper rigidity in action, both of these ways H consist of a single casting, being joined together by the substantial cross-bar shown at Z. (See Fig. 4.) This arrangement preserves at all times perfect alineinent of the ways H, prevents any tendency of said ways to lag or bind in relation to each other, and

also serves to positively revent any tendency on the'part of the s eeve F to rotate. Furthermore, owing to this form of rigid construction the fulcrum screws H by means of which ways H are connected to sleeve F, are released from all undue and improper strains and perform only their proper function of swiveling the ways to the sleeve. In these ways slides the adjustable frame H connected to the carriage H by screws H. The front end of the frame H is slotted, and in the slot lies a segment H to which the frame is clamped in any convenient manner, so that the frame H may beset at any angle to.the carriage and the ways H will adjust themselves to the angle of the frame H I prefer to use for the pur ose a hook-bolt, which lies in the end of t e'frame H one edge of which engages the segment H, the nut H serving as a clamp-nut. Such being the construction, it will be seen that the reciprocation of the carriage H will also reciprocate the frame H which will serveas inclined planes to lift the ways H, and consequently the sleeve F, as they move to the left (see Fig. 2) and allow'them to fall as the slide moves to the right. The segment may be marked off with any desired scale, and the frame H may thus be set to lie parallel to said carriage, in which case the tool-holder will not reciprocate, or it may be set at any desired angle to the carriage, or preferably the scale instead of degrees may-be in units, which will indicate the length of reciprocation of the tool-holder. To counteract the weight of thevarious parts, and so render the lifting of the tool-holder more easy of accomplishment, Iconnect the sleeve F, by means of a link J, with a rocking frame hung in brackets J, attached to one end of the case. The links J connect the sleeve with the long arm j of the frame, the short arm y" being connected by the links j with a spring j, running to the other end of the case, where it is provided with a pin j, which rests in av hook 1' hanging. from the interior of the case. A

rocker-shaft j connects the arms j and j.

The spring is preferably provided with a thickened extension 3' through which passes an adjusting-screw j by which the spring may be adjusted to-the strength desired.

In addition to the parts above described the machine has a belt-shipper B of ordinary construction on the end of the rod b, which is mounted in bearings b, rojecting from the The s ipper is thrown by means of a grooved piece 6 on the rod Z). In the groove of this piece works a pin 6 atthe case and has a handle I) by the tin-nin h which wor s a pin on the disk /('4, carried in a shaft on the end of which is the handle k'". Turning the handle one way or the other throws the clutch in or out, as the case may be, and connects or disconnects the cone-pulley with the shaft. .Stops are also provided in this case to limit the throw of the handles The grinder C is preferably an emery-wheel on the end of a shaft C, which runs in bearings C preferably supported in such manner that the grinder may be moved toward and from the work or laterally to one side or the other of the axis of the'work. In order to adjust the grinder laterally, the support C for the bearings C is mounted in wa s con a carriage L, the ways 0 running para lel 'with the axis of the shaft 0; By means of a screw passing through a threaded projection C on said carriage and engaging the support C the position of the support C on the carriage L may be changed in a way which will be easily understood.

The carriage L may be adjusted to feed the grinder to or from the work by the following means: The carriage L is mounted in ways on the platform A on top of the case, and it.

has a nut Z, through which runs the threaded end of a rod Z. The farther end of this rod Z carries a hand-wheel Z and is supported in freely on the rod Z, except when bound thereto by a clutch. Such a clutch is shown at Z as a cone which enters a recess in the gear Z and may be caused to engage the gear by means of a clutch-rod Z, located in the passage m and rigidly attached bya pi'n Z" to the clutch Z the clutch-rod carrying a nut Z on its outer end which is threaded. Upon turning the nut against the hand-wheel Z the clutch is bound against the gear. The rod Z is slotted atZ, and the pin Z passes through the slot, the slot being long enough to allow some little play of the pin therein and yet being narrow, so that the gear will communicate motion through the pin to the rod Z when the clutch is engaged.

When the clutch is not engaged with the gear, the rod Z may be turned by the handwheel Z to roughly adjust the position of the aged, however, the grinder can only be ad usted through the instrumentality of gear of the periphery of the wheel.

which is automatically moved in a way now to be described during the operation of the machine.

A worm m engages the gear Z and is turned by means of a ratchet-clutch of peculiar character, (see Figs. 7 and 8,) comprising a chambered wheel m, fast on the shaft m on which is the worm m. The wheel m is inclosed in a casing of which one portiona disk m and a rim mare fast on the casing M. The other wall is a disk m free to turn on the shaft m On the interior of this disk m are mounted two pawls m each flexibly controlled by a spring we and adapted to engage the inner rim of the wheel m and turn it when movement is given to the disk m, as below described. The wall m may have similar pawls to act as holding-pawls to keep the wheel from retreating. These pawls work in opposite sides of the wheel.

in M, extending from the exterior of the disk m is connected by a link M with a segment M in which is a T-slot, in which the end of the link M may be'adjusted by a suitable screw. One end of this segment M is attached to a shaft M, which passes through a bearing in the wall of the casing and carries on its inner end an arm M the free end of which rests on a stop M". This construction is such that by oscillating the free end of the arm M the worm m will be turned and the grinder C will be fed gradually, the upward movement of the arm M feeding the grinder, the downward movement being ineffective. roll M mounted on a stud on the gear d By means of this adjustment the grinder may be moved a comparatively long or short distance, accordingto the needs of the work. When finishing the edge of the tool, for example, a very fine feed is desired, while if the tool is dull and needs considerable grinding a heavier feed may be used at first. The experience of the operator will teach him as to this. By this adjustment, however, the feed may be made appreciable to the eye or it may be reduced to an almost infinitesimal quantity.

I provide a gage by means of which to set the tools at the proper height with relation to the grinder. This consistsof an arm N, attached to the endof a vertical rod n by a thumb-screw n", this rod being adjustably supported by a set-screw n in a socket n on top of the case. The gage is set so that when its arm extends over the tool and the points of the tool touch it the beveled edge of the tool will stand in proper relation (preferably approximately parallel) to a portion When the gage is once set, its position does not ordinarily require to be altered except as its armis swung over the tool-holder in placing a tool The arm is lifted by means of a in the machine or out of the way again to allow the grinding operation to take place. The height of the tool is adjusted by raising or lowering the shank F unscrewing the setscrew F for the purpose. 1 By reference to the foregoing the details 0 the operation of my machine will now be described. By reference to the drawings it will be seen that the counter-shaft D passes entirely through the machine and projects through the casing on the front side and is supported in the bushing shown. This projecting portion of the shaft D is squared, as shown, for the purpose of receiving a handle by which it may be turned by hand, said handle being easily applied or removed. Now to operate the machine the handle 10 is turned to withdraw the clutch K from its connection with the pulley D. The handle above mentioned is now applied to shaft D and the machine turned by hand until the vertical shaft F is brought to its lowest position. (See Fig. 2.) The set-screw F 6 in the shaft F, as stated above, will now stand either to or from the rinder. The nut H on the frame H is now oosened and the frame H set at the required an le by means of the graduations on the arc 5 and the nut H again set up. Now the shank F of the proper tool-holding chuck is placed within the bore of the shaft F, and as the set-screw F is set into the semicircular groove F 5 the platform f will hold the before-mentioned pin y in the same vertical plane as the groove F Now when the cutter f 5 is placed on the platform f 2 and the nut f 3 screwed down the pin in the platform and the hole in the cutter before mentioned will cause the extreme points of the cutter to lie in the same vertical plane as the set-screw in the shaft F, thus properly locating the cutter upon the platform. This arran ement, together with the gage N, enables the cutter to be set correctly immediately and without trouble. The screw n is now loosened and the gage N swung over the points of the cutter, and the set-screw F being again loosened the shank F 4 is raised until the points of the cutter f 5 meet the under surface of the gage N, when the setscrew F" is again set up. The gage N is now swung back and secured by screw n, and the handle is removed from the shaft D. Also by this arrangement a cutter once ground can be replaced upon the machine for resharpening, and the grinder. will at once fall right in upon the surface formed at the previous grinding and follow it precisely. Thus it is only necessary to grind just enough to bring up a new keen edge, economizing both time and cutter. These parts are always in adjustment and do not need to be altered, even though the size, shape, or length of the cutter should be changed. After the machine is set as above described a half-turn of the handle I) starts the grinder As is stated above, the depth of the V in the sides of the tool f 5 is dependent upon the vertical stroke which is given to the tool, and this is dependent upon the angle at which the arm H is set to the carriage which supports it. This adjustment may be changed by loosening the nut H and setting the frame II to any desired point on the segment, which preferably carries a scale indicating the hei ht in fractions of' an'inch to which the:

tooI will be lifted with each reciprocation of the carriage.

I have shown in the'drawings the best form of my invention now known to me; but I realize that it may be embodied. in other mechanisms by which the essential movements may be given to the tool-holder and grinder. My machine, however, is small and compact and has proved its value for the purpose intended.

What I claim as my invention is- 1. In a machine for grinding aroundingtool provided with a serrated or V-shaped cutting edge, a continuously rotary tool-' holder for grasping and holding the said tool by the non-cutting end or edge thereof, a rotary grinder and means for reciprocating said grinder and tool-holder with relation to one another whereby the grinder may con tinuously follow the toothed or serrated edge of said tool as'it is turned by the tool-holder.

2. In amachine for grinding a roundingtool provided with a serrated Orv-shaped cutting. edge, a continuously-rotary toolholder for grasping and holding said tool by the non-cutting end thereof, a rotary grinder and means for reciprocating said tool-holder whereby the cutting edge of said tool is made to describe a path of movement corresponding with the'shape of the tooth or teeth and the same is, presented continuously to the edge of said grinder.

3. In a machine for grinding a roundingtool provided with a serrated or V-shaped cutting edge, a continuously-rotary toolholder for grasping and holding said tool by the non-cutting end thereof, a rotary rinder,

means for reciprocating said too -holder whereby the cutting edge of said tool is made to describe a path of movement corres ending with the shape of the tooth or teet and the same is presented"continuously to the edge of said grinder, and .means for auto-' matically and positively changing the opera-1 tive position of said grinder.

'4. In a machine for grindinga rounding, toolprovided with a serrated or V-shaped cutting edge, a continuously-rotary toolmeans for reciprocating said too -holder to describe a'path of movement corresponding with the shape of the-tooth or'teeth and ed e of said grinder, andmeans for-adjustabIy determining the amount of said reciprocation. i

5. In a tool-grinding machine, a continuously-rotating tool-holder, a rotary grinder, means for reciprocating the one with relation to the other, and means for intermittently feeding the one toward, the other. 7

6. In a tool-grinding machine, a continuously-rotating tool-holder, a rotary grinder, means for reciprocating said tool-holder, means for adjustably determining the amount of its reciprocation, and means for intermittently changing the operative position of said grinder.

'7. In a tool-grinding machine, a continuously-rotating tool-holder, a rotary grinder, means for reciprocating said tool-holder in a line parallel with the axis of its rotation, means for intermittently feeding said grinder for chan ing the operative position of the same, and the amount of said feed.

8. In a tool-grinding machine, a continugrinder, and means for reciprocating the one with relation to the other in a line parallel to the axis of rotation of the tool, asset forth.

9. In a tool-grinding machine, a continuously-v rotating tool holder and a rotary eating thetool holder and grinder with relation to each other and in a line parallel to the axis of rotation ofsaid' tool-holder, as set forth. p

101 In a tool-grinding machine, a rotary tool 'holder, and a rotary grinder, and means for reciprocating said tool-holder comprising an angular frame adapted to be reciprocated and means connecting said angular frame with the tool-holder, as described;

)11'. In a tool-grinding machine a rotary tool-holder and a rotary grinder, means for reciprocating said tool-holder comprising a slide moving at right angles to the axis of frame adapted to engage said tool-holder, as .and for the purposes described. I

12. In a tool-grinding machine a rotary tool-holder, a rotary grinder and means for reciprocating'said rotary tool-holder in a line parallel with its axis comprising a horizontal reciprocating carriage, an inclined frame carried thereby, the angle of its inclination being adjustable with relation to the carriage, said inclined frame being-adapted to engage gE said tool-holder, as set forth.-

whereby the cutting edge of said tool is made means for adjustably determining ously-rotating tool-holder, and a rotary grinder, and adjustable means for 'recipro at right angles to the axis of the tool-holder,

holder for grasping and holding said tool by the non-cutting end thereof, a rotary rinder,

the same is presented continuously to the said tool-holder and carrying an inclined in a direction parallel with said carriage and connections between said slide and said calriage whereby a 1nove111ent of the one will cause a corresponding parallel 111ovcn1ent ol' the other, and means for operating said slide, as described.

l4.In a tool-grinding machine a rotary tool-holder, a rotary grinder, and means for automatically reciprocating said tool-holder in a line parallel with its axis comprising a carriage moving at right angles to the axis of said tool-holder and means connecting said carriage and said tool-holder, whereby the movememt of said carriage will cause the reciprocation of said tool-holder, and means for reciprocating said carriage, comprising a slide, connections between said slide and said carriage whereby the movement of the one will cause a corresponding parallel movement of the other,'and a cam, and connections between said cam and said slide whereby the rotation of said cam will cause the reciprocation of said slide, as set forth.

1:"). I11 :1 tool-grinding machine a rotary grinder, and a rotary tool-holder, and means adapted to cause the reciprocation of said tool-l1older comprising pivoted ways mounted on the sides of said tool-holder, a carriage and means for reciprocating it at right angles to the axis of said tool-holder, a frame connected to said carriage and adapted to run in,

said ways, and means whereby said frame is set at a predetermined angle to said carriage, as set forth.

16. In a tool -grinding. machine, a -toolholder comprising a shaft, a sleeve surrounding and supporting said shaft, means for rotating said shaft within said sleeve, and means whereby said sleeve and said shaft may be moved together in a line parallel with the axis of said shaft, as described.

17. In a tool-grinding machine, a toolholder comprising an adjustable shank, a-

shaft carrying said shank, a sleeve surrounding said shaft, and means whereby said shaft is rotated in said sleeve, and said sleeve and shaft are reciprocated in combination with a rotary grinder, as described.

18. A tool-grinding machine having a toolholder, means whereby said tool-holder may be reciprocated, said means comprising a'carriage having a movement at right angles to the axis of said tool-holder, and yielding means tending to counteract the weight of said tool-holder, as described.

19;. In a tool-grinding machine, a toolholder, a horizontally-moving carriage suprotary porting said tool-holder, and means whereby the movement -.of said carriage is comrnuni eated to and rcsultsfin a vertical 1.11o\'en1entof said tool-holder,and yieldingnuai'nsw.l1ereby the weight of sa d tool-holder is more or less counteracted, as descrlbed.

.20. In a tool-grinding 111a chi11e, a time holder adapted to be reciprocated, a carriage adapted to be 111o\ed horizontally, connections between said carriage and said toolholder whereby said tool-holder will be reciprocated vertically, and means for counterbalancing the weight of the vertically-moying parts, comprising a rocking frame, means for connecting said rocking frame with said toolholder, and a hft1ngspr1ng connected to s111d rocking frame, as and for the purposes de scribed.- I

21. In a grinding-machine, a tool-holder adapted to be reciprocated yertically; horizontal ways, a carriage ada'ptedto run in said ways, connections between said carriage and said tool-holder whereby said tool-holder will be reciprocated with the reciprocation of said carriage and at right angles thereto, arocking frame connected to said tool-holder, and a spring adapted to lift said tool-holder, one

end of said spring being connected with said 1 rocking frame, means for supporting the other end of said spring, and means for adjusting its tension, as described. I .22. In a grindingmachine, a: rotary grinder, a tool-holder and means whereby said tool-holder is rotated and reciprocated in a line parallel with its axis of rotation, and means whereby said grinder is fed toward and from said toolholder, as described.

23. In a grindingmachine, a grinder mounted on a carriage, said carriage being provided with an adjusting-nut, a screw assin throu h said nut means whercb b b n said screw is rotated, a tool-holder, and means connecting said tool-holder with said screw-rotating means, wherebythe movements of said tool-holder will causethe feeding ofsaid grinder, as set forth.

24. In a grindingmachine, a grinder mounted on a carriage, said carriage being provided with an adj usting-nut, a screw passing through said nut, means whereby said screw is rotated, at tool-holder, and means whereby said screw-rotating means is oper ated to feed the carriage automatically and said tool-holder is r eciprocated, as set forth.

.25. In a tool-grinding machine, a rotary tool-holder, a rotary grinder, a feed adapted to feed said grinder toward salo tool-holder,

and means connecting said grinder and said' tool-holder, whereby the rotation of said toolholder andv the feed of said grinder will take place simultaneously, as described.

26. In a grin(ling-macl1ine, the grinder mounted upon a carriage, means for ad justing said carriage, and also for feeding said carriage, said means comprising a nut attached to said carriage, a screw working therein and common to both feeding and adjusting mechanisms, an automatic mechanism adapted to be connected with said screw to turn it, a hand turning mechanism also adapted to be connected to said screw and a clutch connecting said screw and said automatic turning mechanism whereby by disengaging said clutch the turning of said screw maybe accomplished by hand and upon engagement of said clutch the turning of said screw will be accomplished automatically, as described.

27. In combination with a rotary toolholder and a grinder, a feeding mechanism for said grinder comprisin a feed-screw, a gear free to turn thereon an forming one member of a clutch mechanism, a second member of said clutch mechanism connected with said feed-screw to turn therewith, and means whereby said clutch and said gear are clamped together, as set forth.

28. In combination with a rotary tool holder and a grinder, a feeding mechanism for said grinder comprisin a feed-screw, a gear free to turn thereon and forming one member of a clutch mechanism, a second member of said clutchmechanism connected with said feed-screw to turn therewith, and means whereby said clutch and said gear are clamped together, said means comprising a clutch-rod entering the end of said feed screw and pinned therein, and capable of a limited longitudinal movement with relation thereto, a clutch member. attached to said clutch-rod, and a-set-nut on said clutch-rod adapted to bind said clutch member against said gear, as described.

29. In a tool-grinding machine,--a toolgrinder and means whereby is fed automatlcally toward and from the tool comprisinga feed-nut, a screw, a gear mounted on said feed-screw, a worm engaging said gear, and means for giving said worm an intermittent rotary motion, a rotary tool holder, and means connecting said tool-holder and said intermittent worm-rotating means whereby it is operated, as described.

30. In a tool-grinding machine, means for feeding said tool-grinder comprising a feedscrew, a gear mounted thereon, a worm adapted to engage said gear, a clutch on sand worm, means for operating said clutch to ro tate said worm intermittently comprising a rocking frame, and means whereby said rocking frame is rocked, and an adjustable connection between said rocking frame, and said clutch, as set forth.

31. In a tool-grinding .machine, a toolgrin'der mounted on the carriage, means for feeding the saidcarriage comprising a screw, a gear upon said screw, a worm engaging said gear, a wheel located on the worm-shaft, a disk. free to turn on said shaft, pawls connecting said disk and said wheel, and a rocking frame, and means whereby it is rocked, and means for adj ustably connecting said rocking frame Withsaid disk, as described.

- J. GEORGE POOL.

In presence of F. F; RAYMOND, 2d. M. V. FOLEY. 

